3.3 - Manner

After taking a set position inside the service
zone, a player may begin the service motion--any continuous movement
that results in the ball being served. Once the service motion begins,
when the ball leaves the hand, it must next bounce on the floor in the
zone and then, without touching anything else, be struck by the racquet
before it bounces on the floor a second time. After being struck, the
ball must hit the front wall first and on the rebound hit the floor
beyond the back edge of the short line, either with or without touching
one of the side walls.